/Engine/Plugins/MovieScene/MovieRenderPipeline/Source/MovieRenderPipelineCore/Public/Graph/MovieGraphFilenameResolveParams.h
This data structure contains a list of key-value pairs (as strings) for both filename resolving, and file metadata. They are stored as two separate arrays (as metadata is often a bit more verbose/human friendly) and it is not required that the two arrays be in sync. When resolving final filenames, any {tokens} will be replaced with a matching key-value if found in the FilenameArguments variable. Because of this, FilenameArguments should be short and avoid illegal filename chars.
[USTRUCT](Programming/UnrealArchitecture/Reference/Structs)([BlueprintType](Programming/UnrealArchitecture/Reference/Structs/Specifiers/BlueprintType)) struct FMovieGraphResolveArgs
TMap<FString, ...
FileMetadata
A set of Key/Value pairs for file metadata for file formats that support metadata.
TMap<FString, ...
FilenameArguments
A set of Key/Value pairs for output filename format strings (without {}) and their values.